I have tomatoes and peppers planted in my greenhouse and I have to water them about every other day; but we've been having a run of sunny days and it gets HOT in there! Oh, and a cool trick one of our other members (Rick Corey) mentioned for bottom watering is to leave one cell empty and use that as a spot to pour water into the tray. Seems obvious, but *I* never thought of it!
And what I generally do when the seeds are first planted and closer to the surface is to use a spray bottle to keep the top part moist. I don't generally bottom water (after the initial soaking) till the seeds sprout. But that's just me.